Now it's a playground fight between Delta and Alaska Airlines

The fight for dominance at Seattle-Tacoma International Airport between Delta and Alaska Airlines is now a playground fight.

Literally.

On Tuesday, Delta said it helped build a playground at the University Heights Center in Seattle, in conjunction with national nonprofit KaBOOM! It's the second playground Delta has built locally; it also built a playground at Brannan Park in Auburn

Delta is trying to flex its muscles at Sea-Tac Airport; an effort that's garnering national attention. On Monday, its playground effort saw 100 Delta employees volunteer to build the playground and the airline also donated $10,000 to the University Heights Center.

"It is at the heart of Delta's culture to give back and be good stewards in the communities in which we live and work," said Mike Medeiros, Delta's vice president – Seattle, i n a statement.